Prep time: 5 minutes plus 1 hour freezing time Serves: 1
20g watercress, roughly chopped
50ml pink grapefruit juice
250ml tonic water
To serve (optional)
Pink grapefruit slices
To make decorative ice cubes for your cocktails, place a few watercress sprigs, petals or pomegranate seeds into the sections of an ice cube tray. Fill with water and leave to freeze solid for at least one hour.
Muddle together the gin and watercress by putting them both into a jug and mashing well with a fork. Strain the gin through a fine meshed sieve to remove the chopped watercress while still leaving the flavour. Add the grapefruit juice to the gin and mix.
Take two gin and tonic glasses or large tumblers and fill with ice cubes. Pour over the gin and grapefruit, then top up to the desired level with tonic water. Garnish with a slice of pink grapefruit and serve immediately.